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    <article class="post">
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            <h1 class="post-title">全面分析CustomPainter相关类</h1>
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        <date class="post-meta meta-date">
            2021年9月14日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
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                    阅读</span></span>
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        <div class="post-content">
            <h5 id="本文测试案例">.本文测试案例</h5>
<p>Flutter 框架中的三位主角团 <code>Element</code>、<code>RenderObject</code>、<code>Widget</code> 是最顶层的抽象。它们三者之间存在着什么关系呢？<code>CustomPainter</code> 在这三位的光环下，又扮演这什么样的角色呢？本文将通过一个精简的绘制案例，来稍稍揭开一点  Flutter 框架运转的秘密。如下代码，直接使用 <code>CustomPaint</code> 组件作为 <code>runApp</code> 的入参。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/18f43c47b32b48ec932f06ad4861109d~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/18f43c47b32b48ec932f06ad4861109d~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">void</span> main() <span style="color:#f92672">=&gt;</span> runApp(CustomPaint(
      painter: ShapePainter(color: Colors.blue),
    ));

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">ShapePainter</span> <span style="color:#66d9ef">extends</span> CustomPainter {
  <span style="color:#66d9ef">final</span> Color color;
  ShapePainter({<span style="color:#66d9ef">this</span>.color});
  
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> paint(Canvas canvas, Size size) {
    Paint paint <span style="color:#f92672">=</span> Paint()..color <span style="color:#f92672">=</span> color;
    canvas.drawCircle(Offset(<span style="color:#ae81ff">100</span>, <span style="color:#ae81ff">100</span>), <span style="color:#ae81ff">50</span>, paint);
  }
  
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">bool</span> shouldRepaint(covariant ShapePainter oldDelegate) {
    <span style="color:#66d9ef">return</span> oldDelegate.color <span style="color:#f92672">!=</span> color;
  }
}
<span style="color:#960050;background-color:#1e0010">复制代码</span>
</code></pre></div><h4 id="一custompainter-相关对象">一、CustomPainter 相关对象</h4>
<h5 id="1-custompaint-类简介">1. CustomPaint 类简介</h5>
<p>现在台面上只有 <code>CustomPaint</code> 和 <code>CustomPainter</code> 两个类，下面是它们的继承关系。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a53a26a9d5754fbc99794c24127324fa~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a53a26a9d5754fbc99794c24127324fa~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p><code>CustomPaint</code> 是一个 Widget 的子类，我们知道 <code>Widget</code> 是一个功能很少的抽象类，主要用于 Element 的创建。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/02cf51eb1870498ba6fd898d354b9e7d~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/02cf51eb1870498ba6fd898d354b9e7d~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p>但衍生到 <code>RenderObjectWidget</code> 时，增加了抽象方法 <code>createRenderObject</code> 来创建 <code>RenderObject</code>。 所以这一族的 Widget 承担着创建 <code>RenderObject</code> 的使命。 <code>RenderObjectWidget</code> 本身也是抽象类，所以这两个抽象方法将由它的子类实现。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/6180ad0316654bbea0df64089927b794~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/6180ad0316654bbea0df64089927b794~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p><code>SingleChildRenderObjectWidget</code> 也是抽象类，继承自 <code>RenderObjectWidget</code>，它自身通过 <code>SingleChildRenderObjectElement</code> 完成了 <code>createElement</code> 方法。所以其子类的任务就是实现创建 <code>RenderObject</code> 的那个抽象方法 <code>createRenderObject</code>。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/95b981d300a84d0da23d129dec04a763~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/95b981d300a84d0da23d129dec04a763~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p>就这样，使命的 <code>星火相承</code>，在 <code>CustomPaint</code> 中对 <code>createRenderObject</code> 进行实现。返回的是 <code>RenderCustomPaint</code> ，这样 <code>RenderCustomPaint</code> 便登上了台面 。 <code>CustomPaint</code> 作为一个 Widget 的实现类，拥有 5 个 final 的成员属性，这些属性会在构造方法中进行初始化。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/bfc8fe34cde646898ef4bb7df1fcc8e6~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/bfc8fe34cde646898ef4bb7df1fcc8e6~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<h5 id="2rendercustompaint-类简介">2.RenderCustomPaint 类简介</h5>
<p>现在 <code>RenderCustomPaint</code> 出场，简图如下： 
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/e431793f4e9741dfabe97bf3d91214f4~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/e431793f4e9741dfabe97bf3d91214f4~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p><code>RenderCustomPaint</code> 是 <code>RenderObject</code> 的子类。RenderObject 是一个非常复杂的类，本文并不打算详细说它，后面有机会单独写一篇。这里简单地认识一下它：首先它是一个树状结构，通过 <code>adoptChild</code> 和 <code>dropChild</code> 来维持渲染树的节点。其次，该类型对象需要负责布局 <code>layout</code> 和 绘制 <code>paint</code> ，通过 <code>markNeedsPaint</code> 方法可以标记当前 <code>RenderObject</code> 需要被绘制。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">abstract</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">RenderObject</span> <span style="color:#66d9ef">extends</span> AbstractNode <span style="color:#66d9ef">with</span> DiagnosticableTreeMixin <span style="color:#66d9ef">implements</span> HitTestTarget {
  
  Constraints<span style="color:#f92672">?</span> _constraints;
  
  <span style="color:#66d9ef">void</span> layout(Constraints constraints, { <span style="color:#66d9ef">bool</span> parentUsesSize <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span> }) {...}
  <span style="color:#66d9ef">void</span> paint(PaintingContext context, Offset offset) { }
  
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> adoptChild(RenderObject child) { ... }
  
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> dropChild(RenderObject child) { ...  }
  
  <span style="color:#66d9ef">void</span> markNeedsPaint() {}
}
<span style="color:#960050;background-color:#1e0010">复制代码</span>
</code></pre></div><hr>
<p><code>RenderBox</code> 是目前 Flutter 框架中 <code>RenderObject</code> 的直系子类。它是 <code>二维笛卡尔坐标系中的渲染对象</code>，在 <code>RenderObject</code> 中只定义了约束 <code>BoxConstraints</code> ，在 <code>RenderBox</code> 中进一步定义了尺寸 <code>Size</code> 。一个 Size 对应一个布局范围的 box ，在这个范围内就是一个左上角为 <code>0,0</code> 的笛卡尔坐标系。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b1e1eac326f04de19f41ed884c54799a~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b1e1eac326f04de19f41ed884c54799a~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p><code>RenderCustomPaint</code> 是最终的实现类，它实例化的时机是 <code>CustomPaint</code> 组件调用 <code>createRenderObject</code> 时。其中构造函数的入参也就是 <code>CustomPaint</code> 的那几个成员，也就是说，我们自定义的 <code>CustomPainter</code> 画板最终会交给这个类进行使用。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/5e72ef654868465e95989300a01e39fe~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/5e72ef654868465e95989300a01e39fe~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>目前这几个类之间的关系简图如下：</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f1abc6e90156436ca2c502bdb56b5784~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f1abc6e90156436ca2c502bdb56b5784~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<h5 id="3custompainter-类简介">3.CustomPainter 类简介</h5>
<p><code>CustomPainter</code> 是一个抽象类，它继承自 <code>Listenable</code> ，内部还持有一个 <code>Listenable</code> 类型的成员 <code>_repaint</code> ，它有两个抽象方法 <code>paint</code> 和 <code>shouldRepaint</code> 。 所以想使用 <code>CustomPainter</code>  就需要继承它，并实现其抽象方法。它被 <code>CustomPaint</code> 持有，并传递到 <code>RenderCustomPaint</code> 类中。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b3c9220cf6384cb78dce5e1c8e7d5ed0~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b3c9220cf6384cb78dce5e1c8e7d5ed0~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>上一篇 <a href="https://juejin.cn/post/6916297631366905864">CustomPainter 正确刷新姿势 </a> 中说到，可以通过 <code>repaint</code> 设置可监听对象来触发画板刷新。从这里就可以看到其中的原理。在 <code>RenderCustomPaint#attach</code> 方法中 <code>_painter</code> 会添加监听执行 <code>markNeedsPaint</code> 方法，从而触发重绘。而 <code>CustomPainter#addListener</code> 就是在监听 <code>_repaint</code> 成员的变化，触发回调。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#f92672">----&gt;</span>[RenderCustomPaint<span style="color:#960050;background-color:#1e0010">#</span>attach]<span style="color:#f92672">----</span>
<span style="color:#960050;background-color:#1e0010">@</span>override
<span style="color:#66d9ef">void</span> attach(PipelineOwner owner) {
  <span style="color:#66d9ef">super</span>.attach(owner);
  _painter<span style="color:#f92672">?</span>.addListener(markNeedsPaint);
  _foregroundPainter<span style="color:#f92672">?</span>.addListener(markNeedsPaint);
}

<span style="color:#f92672">----&gt;</span>[CustomPainter<span style="color:#960050;background-color:#1e0010">#</span>addListener]<span style="color:#f92672">----</span>
<span style="color:#960050;background-color:#1e0010">@</span>override
<span style="color:#66d9ef">void</span> addListener(VoidCallback listener) <span style="color:#f92672">=&gt;</span> _repaint<span style="color:#f92672">?</span>.addListener(listener);
<span style="color:#960050;background-color:#1e0010">复制代码</span>
</code></pre></div><hr>
<h4 id="二-renderobjectelement-登场">二、 RenderObjectElement 登场</h4>
<p>这时会有一个问题：<code>CustomPaint#createRenderObject</code> 是在何时被触发的？遇事不决，调试一下。可以看出是在 <code>RenderObjectElement.mount</code> 方法中被触发的。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/5cb3b2687d58488fb937186cc2526cef~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/5cb3b2687d58488fb937186cc2526cef~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p>可以看一下当前的 this 对象，是 <code>SingleChildRenderObjectElement</code> 类型，可见它持有一个 <code>_widget</code> 成员，正是之前传入的 <code>CustomPaint</code> 对象。通过<code>widget.createRenderObject</code> 为成员 <code>_renderObject</code> 赋值。另外入参是 this，也说明入参的 <code>BuildContext</code> 对象正是当前的 <code>SingleChildRenderObjectElement</code>。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4866dec9a0b44ed997e2ed4e4ec95a36~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4866dec9a0b44ed997e2ed4e4ec95a36~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<p>当 <code>SingleChildRenderObjectElement</code> 浮上台面，这张简图便丰富了。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/bd4426195c874ad5aed6084cc163be9e~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/bd4426195c874ad5aed6084cc163be9e~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p><code>Element</code> 是元素抽象的顶层，本身持有 <code>Widget</code> 对象，会衍生出两大种类：<code>ComponentElement</code> 和 <code>RenderObjectElement</code>。其中只有 <code>RenderObjectElement</code> 才持有 <code>RenderObject</code>。也就是说，对于<code>RenderObjectElement</code> 而言，会同时持有 <code>Widget</code> 和  <code>RenderObject</code>。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/9053fb05d01542f9bdf6c4233befef99~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/9053fb05d01542f9bdf6c4233befef99~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>总结一下，<code>RenderObjectElement</code> 的 <code>RenderObject</code> 成员会在执行 <code>mount</code> 方法执行时进行赋值，其值为使<code>RenderObjectWidget#createRenderObject</code> 返回值。到这里便可以总结一下这几个类直接的关系了。</p>
<hr>
<h4 id="三相关各类之间的关系">三、相关各类之间的关系</h4>
<h5 id="1renderobjectwidget-和-renderobject-的关系">1、<code>RenderObjectWidget</code> 和 <code>RenderObject</code> 的关系</h5>
<p><code>RenderObjectWidget</code> 作为一个 <code>Widget</code> 的衍生类，拥有创建 <code>RenderObject</code> 对象的使命。其子类必须实现 <code>createRenderObject</code> 抽象方法。两者之间的关系是 <code>创造者-RenderObjectWidget</code> 和 <code>被创造者-RenderObject</code> 。
例如：对于 <code>CustomPaint</code> 组件来说，<code>createRenderObject</code> 方法负责创建 <code>RenderCustomPaint</code> 这个 <code>RenderObject</code> 对象。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#f92672">----&gt;</span>[CustomPaint<span style="color:#960050;background-color:#1e0010">#</span>createRenderObject]<span style="color:#f92672">----</span>
<span style="color:#960050;background-color:#1e0010">@</span>override
RenderCustomPaint createRenderObject(BuildContext context) {
  <span style="color:#66d9ef">return</span> RenderCustomPaint(
    painter: painter,
    foregroundPainter: foregroundPainter,
    preferredSize: size,
    isComplex: isComplex,
    willChange: willChange,
  );
}
<span style="color:#960050;background-color:#1e0010">复制代码</span>
</code></pre></div><hr>
<h5 id="2-renderobjectelement-和-renderobject-的关系">2. <code>RenderObjectElement</code> 和 <code>RenderObject</code> 的关系</h5>
<p><code>RenderObjectElement</code> 作为一个 <code>Element</code> 的衍生类，类中会同时持有 <code>Widget</code> 和 <code>RenderObject</code> 成员。两者之间的关系是 <code>使用者-RenderObjectElement</code> 和 <code>被使用者-RenderObject</code> 。且在 <code>RenderObjectElement#mount</code> 方法中， <code>RenderObject</code> 成员被初始化。
例如：对于 <code>SingleChildRenderObjectElement</code> 对象来说，<code>RenderObject</code> 类型的 <code>_renderObject</code> 是该对象的一个成员。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#f92672">----&gt;</span>[RenderObjectElement <span style="color:#960050;background-color:#1e0010">源码</span>]<span style="color:#f92672">----</span>
<span style="color:#66d9ef">abstract</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">RenderObjectElement</span> <span style="color:#66d9ef">extends</span> Element {
  RenderObjectElement(RenderObjectWidget widget) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(widget);
  <span style="color:#960050;background-color:#1e0010">@</span>override
  RenderObjectWidget <span style="color:#66d9ef">get</span> widget <span style="color:#f92672">=&gt;</span> <span style="color:#66d9ef">super</span>.widget <span style="color:#f92672">as</span> RenderObjectWidget;

  <span style="color:#960050;background-color:#1e0010">@</span>override
  RenderObject <span style="color:#66d9ef">get</span> renderObject <span style="color:#f92672">=&gt;</span> _renderObject; 
  RenderObject _renderObject;
  <span style="color:#960050;background-color:#1e0010">@</span>override
  
  <span style="color:#66d9ef">void</span> mount(Element<span style="color:#f92672">?</span> parent, <span style="color:#66d9ef">dynamic</span> newSlot) {
    <span style="color:#66d9ef">super</span>.mount(parent, newSlot);
    _renderObject <span style="color:#f92672">=</span> widget.createRenderObject(<span style="color:#66d9ef">this</span>); <span style="color:#75715e">// RenderObject 成员初始化
</span><span style="color:#75715e"></span>  <span style="color:#75715e">// ...
</span><span style="color:#75715e"></span>}
<span style="color:#960050;background-color:#1e0010">复制代码</span>
</code></pre></div><hr>
<h5 id="3widget-和-element-的关系">3.<code>Widget</code> 和 <code>Element</code> 的关系</h5>
<p>从 Widget 类的那短短几行源码也可以看出：<code>Widget 最重要的目的是创建 Element </code> 。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fdfb6ac05ce74ef38e8b3d2d06decfeb~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fdfb6ac05ce74ef38e8b3d2d06decfeb~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>每个 Element 都会持有一个 Widget 对象，并且这个 Widget 对象创造了该元素。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/950a2ae1bfe746de9bcfd6d851f28a49~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/950a2ae1bfe746de9bcfd6d851f28a49~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>另外， <code>Widget#createElement</code> 在整个 Flutter 框架中<code>只出现过两次</code>，其一是根元素节点创建时。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c21a5611f5b84cfab1ec9e311a39cff0~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c21a5611f5b84cfab1ec9e311a39cff0~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>其二就是的 <code>Element#inflateWidget</code>，可以说这里是 <code>Element</code> 的孵化室，除了根元素节点外，所以的 Element 都是在这个方法里实例化的。这个主题有机会再细说。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fc4cbb50ecbc4751ab93a8093a168427~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fc4cbb50ecbc4751ab93a8093a168427~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<p>现在应该对整体有了一个简单地把握，通过下面的图片可以让你更形象地认识它们之间的关系。</p>
<p>
        <a data-fancybox="gallery" href="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d5ee71bf57a04d5c87be7ef2c799d813~tplv-k3u1fbpfcp-watermark.awebp">
            <img class="mx-auto" alt="img" src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d5ee71bf57a04d5c87be7ef2c799d813~tplv-k3u1fbpfcp-watermark.awebp" />
        </a>
    </p>
<hr>
<h5 id="4custompainter-相关类小结">4.CustomPainter 相关类小结</h5>
<p>我们可以看出，和 <code>CustomPainter</code> 相关的类有 <code>CustomPaint</code> 这个 Widget，以及 <code>RenderCustomPaint</code>这个 RenderObject 对象。 <code>CustomPaint</code> 只是作为一个载体，将画板对象传给 <code>RenderCustomPaint</code> 。所以和<code>CustomPainter</code> 关系最密切的是<code>RenderCustomPaint</code> 类。在该类中会对 <code>CustomPainter</code> 中的可监听对象进行监听，触发 <code>RenderCustomPaint</code> 对象的重绘，另外 <code>CustomPainter</code> 的绘制操作也是在该类中进行回调的，这里也是 <code>CustomPainter#paint</code> 中 Canvas 对象的来源之处。</p>
<p>本文简单梳理了一下和绘制相关的几个类之间的关系，下一篇将进一步探索 Flutter 绘制相关的源码，全面分析<code>CustomPainter</code>  这个类，着重看一下 <code>paint</code> 和 <code>shouldRepaint</code> 两个抽象方法触发的时机。</p>

        </div>

        
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/flutter_widget/%E5%85%A8%E9%9D%A2%E5%88%86%E6%9E%90CustomPainter%E7%9B%B8%E5%85%B3%E7%B1%BB/">https://luckly.work/post/flutter_widget/%E5%85%A8%E9%9D%A2%E5%88%86%E6%9E%90CustomPainter%E7%9B%B8%E5%85%B3%E7%B1%BB/</a></li>
        <li><strong>版权声明：</strong>本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议</a>进行许可，非商业转载请注明出处（作者，原文链接），商业转载请联系作者获得授权。</li>
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        <li><a href="/post/flutter_widget/CustomPainter%E7%9A%84%E6%AD%A3%E7%A1%AE%E5%88%B7%E6%96%B0%E5%A7%BF%E5%8A%BF/">CustomPainter的正确刷新姿势</a></li>
        
        <li><a href="/post/dart_basic/35%E5%88%86%E9%92%9F%E6%95%99%E4%BD%A0%E5%AD%A6%E4%BC%9Adart/">35分钟教你学会dart</a></li>
        
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        <li><a href="/post/flutter_basic/ElementsKeys%E5%92%8CFlutter%E7%9A%84%E6%80%A7%E8%83%BD/">Elements，Keys和Flutter的性能</a></li>
        
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